Comment #6 on issue 2571 by asmeurer: Regression in Integral.subs http://code.google.com/p/sympy/issues/detail?id=2571
The way I see it, there should be no dummies involved with indefinite integrals.
On the other hand, it doesn't make sense to allow substitution in the integration variable. So I would say Integral(x, x).subs(x, 5) should return Integral(5, x), i.e., 5*x.
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